but you forget obi wan was overwhelmed and had to resort to force as well. Im not saying it is ineffective, but it lacks offense so it is somewhat at a disadvantage. Its not a huge deal, but shien was made to utilize soresu's precise and perfect defense, while still maintaining offensive power. Soresu was made to fight against blasters, this does not render it ineffective in a lightsaber duel, but does make it not decisive and at a slight disadvantage to makashi and djem so. Against ataru the Soresu user holds a distinct advantage due to his defense and the Ataru user will tire. However against a djem so practicioner the soresu user will have trouble maintaining his guard as well as have very few ways to actually hit the djem so user. All down to it it is mainly based on who the duelist are, but as a style I would give the edge to shien or djem so in lightsaber combat, but the edge to soresu in terms of blaster defense and combat.